The effect of vapour locking on the brake performance is that the
Brakes function more effectively
Brakes fail completely
Brake operation is delayed after depression of the brake pedal
Vapour locking has no effect on brake performance
Correct Answer :
B. Brakes fail completely
Related Questions
The petrol engines are also known as
Spark ignition (S.I.) engines
Compression ignition (C.I.) engines
Steam engines
None of these
The ignition in a spark ignition engine takes place when the piston is
Exactly at the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke
How many cells are used in a 12 volt car battery?
2
4
6
8
The basic purpose of tyres is to
Grip the road and provide good traction
Substitute for springs
Act as brake
None of these
In a four cylinder inline engine, the number of firing strokes in one revolution of the crank is
1
2
3
4
Two advantages of using helical gears rather than spur gears in a transmission system are
Strength and cost
Strength and less end thrust
Noise level and strength
Noise level and economy
When the front wheels of a vehicle are locked during braking, then
Stopping distance becomes extremely long
Front tyres skid across the road surface, and the vehicle spins around
Rear tyres skid across the road surface, and the vehicle spins around
Driver loses control over the steering, and the vehicle continues moving in its current direction
The path taken by intake air is
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
The battery is an electrochemical device, which means battery
Makes chemicals by mechanical means
Uses chemical action to provide electricity
Has curved plates instead of flat plates
Does not use an electrolyte
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Allows the steering wheel to be turned by a greater amount when steering
Makes the steering more responsive
Reduces the amount of kickback for large steering angles
The Diesel engine works on
Otto cycle
Carnot cycle
Diesel cycle
Rankine cycle
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on
Too lean mixture
Stoichiometric mixture
Most economical mixture
Too rich mixture
The aluminium alloy is used in cylinder blocks because
It is lighter and has good heat dissipation characteristics
Material cost is low
It does not require any cylinder liners
The piston is also made of aluminium alloy
In a Diesel engine, the fuel is ignited by
An electric spark
The heat of compression
The hot exhaust
None of these
The negative terminal post on the top of a battery is
Smaller than the positive terminal post
Larger than the positive terminal post
Of the same size as the positive terminal post
None of these
The specific gravity of acid in a fully charged battery is generally
1.00
1.28
1.82
2.81
The service brakes employed in cars are generally operated
Mechanically
Hydraulically
Pneumatically
None of these
The advantage of having a tandem master cylinder arrangement in automobiles is that it
Enhances safety by serving two independent lines in a divided line brake circuit
Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as
Supercharging
Auto ignition
Scavenging
Detonation
In petrol engines, during suction stroke, ________ is drawn in the cylinder
Air and fuel
Only fuel
Only air
None of these
Which of the following indicates multigrade oil?
SAE 30
API SF
SAE 20 W50
API 50
The most commonly used power plant in automobiles is
Gas turbine
I.C. engine
Battery
None of these
If the air-fuel mixture in a spark ignition engine is too rich, then airfuel ratio is about
17 : 1
15 : 1
13 : 1
10 : 1
The engine oil viscosity is defined by _________ ratings.
Automatic transmission fluid (ATF)
Society of automotive engineers (SAE)
Gross vehicle weight (GVW)
American petroleum institute (API)
The Diesel engines are also known as
Spark ignition (S.I.) engines
Compression ignition (C.I.) engines
Steam engines
None of these
The function of a governor in automobiles is to
Limit the power
Limit the vehicle speed
Maintain constant engine speed
Maximise the fuel economy
In Diesel engines, the duration between the time of injection and the time of ignition is called
Spill cut-off
Delay period
Injection period
Ignition period
The main task of a battery in automobiles is to
Supply electricity to the alternator
Act as a reservoir or stabilizer of electricity
Supply electricity to the vehicle's electrical system at all times while the engine is running
Supply a large amount of power to turn the starter motor when the engine is being started
The basic characteristics of a brake fluid is
A high boiling point
Low viscosity
Compatibility with rubber and metal parts
All of these
The basic purpose of tyre rotation on automobiles is to
Avoid ply separation
Equalize wear
Get better ride
None of these